Added validation for the number of characters in the name of the receipt

[JamalAlabdullah]

Description

• Added a validation fot hte number of characters in the name of the receipt.

Related Issue(s)

• Danger toast appears when giving a custom receipt a name with only one character #13118

Verification

• Your code builds clean without any errors or warnings
• Manual testing done (required)
• Relevant automated test added (if you find this hard, leave it and we'll help out)

Documentation

• User documentation is updated with a separate linked PR in altinn-studio-docs. (if applicable)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.70%. Comparing base (eece61b) to head (9f52fcf).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #13294   +/-   ##
=======================================
  Coverage   93.70%   93.70%           
=======================================
  Files        1438     1438           
  Lines       19924    19926    +2     
  Branches     2417     2418    +1     
=======================================
+ Hits        18670    18672    +2     
  Misses       1006     1006           
  Partials      248      248           

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[framitdavid]

Great work, @JamalAlabdullah! Could you please add a unit test for this fix to ensure it doesn't happen again in the future?

[framitdavid]

Great job! 👏 Have you had a chance to test this manually? It seems like the checkbox in the PR description hasn't been checked yet.